In a feudal system, a vassal, akin to a serf in most contexts, in general worked land on a lord's fiefdom in exchange for some of the produce from the land and some military protection.
Marx inspired them to rise up and fight against the bourgeois
Equality is the answer to your question.
The United States and the Soviet Union began building up
their military forces very quickly.
This led to a nuclear arms race whereby the two countries
competed for supremacy in nuclear warfare. The result was that each acquired
enough warfare to completely destroy the other resulting in a Mutually Assured
Destruction state of affairs
Many Chinese were not happy about the increasing Western influence so they "<span>C. rose up in the Boxer Rebellion" which sought to restore more traditional values. </span>